package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面，实现公共字段自动填充处理逻辑
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //    切入点,把com.sky.mapper.*.*(..))下面的全部拦截和@annotation(com.sky.annotation.AutoFill光对insert 和update拦截
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    //    前置通知,在切入点之前,在通知中对公共字段进行赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段的自动填充...");

        //获取当前被拦截的方法的数据库操作类型是insert还是update
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        //只拦截@autoFill
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();
        //operationType上面获得的是被拦截的参数

        //获取当前被拦截的方法的参数-实体对象     void insert(Employee employee);例如其中的Employee
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        //这个是拿到的实体Employee(id=17, username=weixu7, name=魏旭7, password=null, phone=18841013374, sex=1, idNumber=211282199708302212, status=null, createTime=null, updateTime=null, createUser=null, updateUser=null)

        Object entity = args[0];


        //准备赋值的数据 一个时间一个id
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        //根据当前不同的操作类型，为不同的字段通过反射其进行赋值
        if (operationType == OperationType.INSERT) {
            try {
                //为4个公共字段赋值,这种是反射的写法
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }


        } else if (operationType == OperationType.UPDATE) {
            //为俩个公共自动赋值
            try {


                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性赋值

                setUpdateTime.invoke(entity, now);

                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
